Step 2:

Step 3:

you are electrolyzing the salt water solution and the sodium chloride is breaking up into sodium and chlorine (warning this is giving of chlorine gas)...

These are the thing you need to make sodium hydroxide any type of container 2 carbon electrodes (you can get these from zinc-carbon batteries) alligator clips water salt (non iodized salt) power source (i used a 9v battery)

You can use it to make traditional german pretzels, or soap, or (assuming you've obtained nearly 100% pure NaOH) you can perform an acid-base titration to (almost perectly) calculate the exact number of the molecules of a certain acid in almost any solution you'd like to know (using an indicator such as phenolphthalein)(and a graduated burette)(and a very very accurate scale, maybe accurate to like 6 to 7 significant figures)(basicly just need access to your college's chemistry lab)